Model G Single Wall Venting Systems Special Gas Vent Applications Model G is a single wall negative, neutral, or positive pressure pre- fabricated piping system intended for use in a variety of applications. SPECIAL GAS VENT APPLICATIONS • Boilers • Water Heaters • Furnaces CATALOG Tested and listed to UL1738/ULC-S636
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Model GSingle Wall Pipe Adjustable Single Wall Pipe A variety of straight pipe lengths are available with Model G. Special lengths are also available and can be made with a minimum
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Model GSingle Wall
Venting SystemsSpecial Gas Vent
Applications
Model G is a single wall negative, neutral, or positive pressure pre-fabricated piping system intended for use in a variety of applications.
SPECIAL GAS VENT APPLICATIONS• Boilers
• Water Heaters
• Furnaces
CATALOG
Tested and listed to UL1738/ULC-S636
Table of Contents
UNDERWRITERS LABORATORIES LISTINGS
Model G in sizes 5" through 48" diameters have been tested and Listed (Safety Certified) by Underwriters Laboratories, Inc. (ULI) and bears the UL and/or c-UL logo signifying compliance with U.S. and/or Canadian standards. UL Listing product categories include:
(USA)Special Gas Vent (UL1738)
(Canada)Type BH Gas Vent (ULC-S636) UL file numbers for Model G include MH16161
• System Overview 4-5• Guide to Component Parts 6• Product Identification 7• Product Listings
• Joint Assembly Parts 8-9• Sealant 8• Single Wall Pipe 10• Adjustable/Variable Pipe 10• Single Wall Fittings 11-13• Connection Accessories 14• Support/Guide Accessories 14-15• Roof Penetrations/Terminations 16
• Technical Data 17-18
Selkirk Sizing/Pressure Calculations
SAMPLE
4
System Overview
Selkirk Model G is a modular, prefabricated venting system which embody flanged joints designed for both quick assembly and pressure-sealing capabilities. They offer structural accessories needed for support attachment to building structures.
Standard gas-carrying venting parts are usable for category II & IV Boiler, Water Heater, and Furnace applications.
Features and Benefits
• Factory-built for high quality, durability and long life
• Stainless steel single wall construction
• Safety tested and listed to multiple UL standards, signifying compliance with U.S. and Canadian codes
• 5" to 48" diameters (ID) to fit the wide range of commercial applications and customer specifications
• Array of components and accessories designed to make a complete installation simple and quick
• Selkirk 5-year limited warranty for Special Gas Vent applications
Complete Line of Fittings
Model G are available in eighteen sizes, from 5" I.D. to 48" I.D. Fittings include various elbows, tees, supports and terminations, as well as a variety of accessory fittings designed to make installation simple and quick.
Each component is shipped complete and ready for installation. Each ordered part includes Inner Vee Bands, and all the necessary hardware.
All items included with each order are listed in this catalog under the part description.
5
System Overview
Exceeding the Requirements
Selkirk, inventors of the positive pressure system concept, far exceeds the requirements of codes and other manufacturers. Results of our testing programs illustrate this fact.
Leak TestsSelkirk conducted system pressure testing (to 15" w.c.) against leakage in the presence of UL inspectors. Results of these tests are impressive. Using the OSHA occupation standard-of-leakage rate of 50 parts per million over an eight hour period as criterion for acceptance, the Selkirk system was tested to a leakage rate of only .144 parts per million, or three-tenths of one percent (.3%) of the maximum allowable leakage per UL.
Seismic TestsWe further demonstrated the superiority of the Model G concept by conducting seismic load tests. These tests proved the structural integrity of our products under severe stress by showing that a guyed stack measuring 20 inches in diameter and exceeding 10 feet above the guying location (installed in strict accordance with the UL103 Listing) could withstand the rigors of all seismic zones.
Structural TestsSelkirk recently tested for greater freestanding limits (termination height above a guide point). These tests, simulating stack performance under 110 mph wind conditions, again demonstrated the superiority of Selkirk products.
6
Guide to Component Parts
This page illustrates some of the major parts described on pages 8-16.
Joint Assembly Parts Overlapping Vee Band VB 8 Special Gas Vent Sealant SGV550 8
Single Wall Fittings 90° Tee MT 11 45° Tee - Lateral JL 11 90° Wye JY 11
Product Code page
Single Wall Fittings (cont) 30° Elbow EL30 12 45° Elbow EL45 12 90° Elbow EL90 12 Drain Tee Cap TC 13 Clean Out Tee Cap TCN 13 15° Elbow EL15 13 Tapered Increaser OT 13 Step Increaser OS 13 Drain Section DS 13 Eccentric Increaser EOT 13 Slope Transition ST 13
Connection Accessories Seal Ring SR 14 Flanged Hood Transition TS 14 Unflanged Hood Transition TSU 14 Fan Adapter FA 14
Product Code page
Support/Guide Accessories Wall Support Assembly WA 14 Wall Guide Assembly WG 14 Half Angle Ring HR 15 Full Angle Ring FR 15 Plate Support Assembly PA 15 Support Strap SS 15
Understanding Product Codes and Part Numbers (Example: 6G316-AG30)
All parts manufactured by Selkirk are identified by a series of numbers and letters which describe their makeup and function.
Here is how to interpret the Part Number designation for Model G products.
1. It begins with the pipe or fitting’s internal diameter (in inches) such as 8, 22, 36, etc.
2. This is followed by the Model designation, G.
3. Next, is the product’s Material designation, 316.
4. Then, following a dash, the product Code name is listed, such as AG30, JY, or MVT.
(For Product Code listings, refer to page 6.)
Thus, the Ordered Part Number for a 30-inch Adjustable Pipe, with a 6-inch I.D., made of 316 Stainless Steel inner is listed:
6G316- AG30
* Note: For products with reduction or increaser parts, the part number changes as follows:
OT - Smaller diameter listed first (before Model designation) Larger diameter listed before Code designation
Example - For a Tapered Increaser with an 8” to 16”dia. Body:
8G316-16OT
8
Joint Assembly Parts
OverlappingVee Band
Code:
VB
Vee Band for connecting inner 1/2" rolled flanges. Capable of holding 15" w.c. of pressure when properly
installed.
Materials Available:
All Stainless Construction
Notes:1. VB’s are a one or two-piece design.
Included with pipe sections.2. Model PS part used for all IPS
applications.
SealantCode: SGV550
SGV550 Sealant is for 550° F. maximum flue gas temperatures, and is applied to the VEE band and pipe flange before connecting two pipes at installation.
Sealant CoverageExpected Number of Joints
Sealed Per Tube
Inner Dia. (inches)
5/6 108/10 912 8
14/16 718/20 622/24 526/28 430/32 3
36 242/48 1
9
Joint Assembly Parts
Joint Assembly
AND ON PIPE FLANGE1/4" DEEP IN VEE BAND GROOVEUSE APPROPRIATE SEALANT
INNER VEE BAND
INNER PIPE
FLANGED INNER JOINTS
10
Single Wall Pipe
Adjustable Single Wall Pipe
A variety of straight pipe lengths are available with Model G. Special lengths are also available and can be made with a minimum dimension of 6" long.
18" & 30" lengths available in all diameters 5"- 48"
42" lengths available in 6"- 42" diameters
60" lengths available in 8"-14" diameters
59" lengths available in 16"-26" diameters
60"42"30"18"
Standard Length CODE: 18, 30, 42 & 60
USE: The G-AG18/30 is used for thermal expansion com-pensation in any pipe line running between two fixed points.
NOTE: For diameters over 26", part G-AG30 must be used.
USE: Part G-VL18 is used as length to fill odd dimensions of 4" to 14". Part G-VL30 is used to fill odd dimensions of 4" to 26".
NOTE: G-VL does not allow for thermal expansion.
18" Adjustable lengthavailable in 5"- 26" diameters
30" Adjustable lengthavailable in 5"-48" diameters
18" Adjustable lengthavailable in 5"- 48" diameters
Graphite Packing Band
Standard Vee Band
Standard Model G Pipe
Adjustable Slip Section
Standard Vee BandSeal Ring (Part of VL)
Standard Model G Pipe
Variable Slip Section
Standard Vee Band
NOTE:
1. Minimum installed length is 4".
2. AG 18 not available for 28" diameter and above.
3. Maximum installed space is when the inner slip section protrudes at least 1/2 pipe diameter into the adjacent pipe.
4. Flow Resistance Factor (K) is the same as insulated pipe lengths.
Flow Resistance Factor is the same as standard pipe.
Flow Resistance Factor is the same as standard pipe.
USE: Used to create immediate 1/4" on 12" slope on horizontal runs. Typically used in pairs (one at lower (inlet) end, other at upper (outlet) end of sloped [1/4 on 12] horizontal run)
CODE: ST
Drain Section DS
USE: Used with open stack termina-tions for draining off rain water from inside vertical or horizontal flue.
CODE: DS
2"
61/2"
DAM
NIPPLE
K= 0.06 flow resistance factor
K= 0.25 flow resistance factor
Cleanout Tee Cap
USE: Used to close Tee opening at the base of a stack or the end of a horizontal run.
CODE: TCN
Tapered Increaser/Reducer
USE: Used when a pipe diameter change is required. Make sure con-densate build-up in larger diameter is drained away downstream of increaser.
CODE: OT
Step Increaser/Reducer
USE: Used when pipe diameter change is required in a small space. Make sure condensate build-up in large diameter is drained away downstream of increaser.
CODE: OS
Eccentric Increaser
USE: The primary increaser used for changing diameters, due to flat bottom for effective condensate flow back to drain.
1. Installed length shall not be greater than longest available straight pipe length.
2. K = N [1-(A/B)2]2
where N = 0.47 for one step EOT
N = 0.53 for one step EOT
Drain Tee Cap
USE: Provides a drain at the base of a vertical chimney when connected to the MT or JL
CODE: TC
PIPE I.D. +1"
Part No. (pipe I.D.) G-TC
1" N.P.T. nipple on 5"- 20" sizes2" N.P.T. nipple on 22"- 48" sizesIncludes one VB
A
B
C
14
Connection Accessories Joint Assembly Parts Support/Guide Accessories
Hood Transition
USE: Securing Model G to flanged appliance outlets.
CODE: TS
Hood Transition (Unflanged)
USE: Securing Model G to unflanged appliance outlets.
CODE: TSU
Wall Guide Assembly
USE: Same use as FR, but with factory-supplied bracing.
CODE: WG
Fan Adapter FA
USE: Designed to secure Model G to fan inlet.
CODE: FA
PIPE I.D.
2 1/2"
PIPE I.D.
3"
SPECIFY CURBDIMENSION
PIPE I.D.
4"
Seal Ring
USE: Used for non-welded attachment to appliances having an unflanged or collar outlet.
CODE: SR
3"
Wall Support Assembly
USE: “Limited” support assembly with factory-supplied bracing.
CODE: WA
PIPE O.D.5"
(2) CF
FR
EXISTING WALL
Ordered Part Includes:
One FR, two CFs, two HCBs, five brackets, two struts, and all hardware except connection at wall.
Notes:
1. Assembly will maintain a 5" clearance between pipe O.D. and supporting structure.
PIPE O.D.4" to 10"
FR
EXISTING WALL
Ordered Part Included:
One FR, four struts, and six brackets.
Notes:
1. Assembly will maintain a 6" to 11" clearance between pipe O.D. and supporting structure.
Materials Available:
Painted Steel
Materials Available:
Painted Steel
15
Support/Guide Accessories
Plate Support Assembly
USE: Used for supporting the load of the stack and as a fixed point anchor near fittings.
CODE: PA
Angle Rings
USE: Used for guiding and/or supporting horizontal installations.
CODE: HR & FR
HR - Half RingFR - Full Ring
Ventilated Thimble
USE: Body part of MVT, MRS, and PVT. Also can be used by itself for a wall pen-etration (see installation instructions). Refer to table on right for all necessary parts.
CODE: THB
Ventilated Storm Collar
USE: Combustible wall penetration. Due to flange on pipe the VSC must be up sized. Additional Storm Collar must be used to close the gap. Refer to table below for VSC and SC parts.
CODE: VSC
Ventilated Roof Thimble
USE: For use where pipe passes through a combustible roof or structure. Also guides the chimney 6" above the roof line. Refer to table below for all neces-sary parts.
CODE: MVT
PIPE I.D. +6"
PIPE I.D. +6"
PIPE I.D. +4"
Ordered Part Includes:
Split (square) plate, one CF, two HCBs and hardware.
Plate Thickness:
0.188" for sizes 5" through 20" I.D. diameters0.250" for sizes 22" through 36" I.D. diameters0.375" for sizes 42" through 48" I.D. diameters
Notes:
1. Two 316 Stainless Steel HCBs should be ordered separately for stainless steel outer projects.
2. PA fabricated from 304 Stainless Steel is available upon request and is non-returnable. Allow extra manufacturing time.
Support Strap
USE: Available in 5" through 28"—G only. 0.188" Thick Rolled Steel.
CODE: SS
2.5"
1.5"MIN
I.D. + .5"1.25"
+
0.44" ø
Materials Available:
Painted Steel
Materials Available:
Painted Steel
(1) Size of Angle = 11/2 X 11/2 X 3/8(2) Size of Angle = 2 X 2 X 3/16
Part No. Bolt Hole I.D. of Ring # of Holes Size of Angle Angle
USE: Used in conjunction with SC for weatherization at the roof.
CODE: TF
Stack Cap
USE: Provides partial protection with low flow resistance. May require a drain at base of stack. Not permitted for CAT II applications.
CODE: SK
Pitched Tall Flashing PTF
USE: Same function as TF, except for use on a pitched roof.
CODE: PTF
Exit Cone
USE: Will increase stack exit velocity 1½ times. Requires a drain at the bottom of stack.
CODE: EC
Storm Collar
USE: Used above the TF and PTF for complete weatherization above the roof.
CODE: SC
Rain Cap (Heatfab Saf-T Vent)
USE: Provides the greatest degree of wind protection and required for use on Category II applications. Sizes available are from 5"-32". Rain cap adapts to G pipe models via the following parts ordered separately: Saf-T Vent Double Flange Adapter (CCA_PS) and Vee-Band (VB). Reference illustration and table below.
CODE: CCA_RC
PIPE I.D.
30
6"
PIPE I.D. +6"
PIPE I.D. +2"
12"
6" 6"
PIPE I.D. +2"
12"
Materials Available:
304 316Aluminized orGalvanized Steel
Materials Available:
304 316Aluminized orGalvanized Steel
Materials Available:
304 316Aluminized orGalvanized Steel
Notes:
1. Requires P600 sealant when installing.
Notes:
1. Use limited to installations where complete roof penetration is non-combustible.
Notes:
1. Part is non-returnable and may require extra manufacturing time. Specify pitch when ordering.
2. Use limited to installations where complete roof penetration is non-combustible.
Leading manufacturer of chimney, venting and air distribution products for commercial and residential HVAC industries for over 80 years.
Inventors of the positive pressure chimney system – Selkirk products meet and exceed the requirements of codes and other manufacturer products.
Industry experts providing engineering and technical support with design services for complete system layouts and special product applications requiring complex routing and unique manifold system design.
Time-tested commercial and industrial installations throughout North America and countries world-wide.